Table 2. Maximum skin dose (mGy) according to clinical, therapeutic and technical factors during percutaneous transluminal coronary angioplasties (n=125).
| Factors | n | Mean | Median | Q1 | Q3 |
| Sex | |||||
| Male | 99 | 981 | 669 | 396 | 1199 |
| Female | 26 | 669 | 714 | 387 | 846 |
| Antecedenta | |||||
| Yes | 27 | 1126 | 719 | 389 | 1343 |
| No | 98 | 859 | 684 | 397 | 1005 |
| Practitioners | |||||
| A | 50 | 598 | 550 | 291 | 902 |
| B | 30 | 1399 | 1154 | 441 | 1989 |
| C | 40 | 1023 | 792 | 566 | 1048 |
| Others | 5 | – | – | – | – |
| Sum of material for dilatation | |||||
| 0 | 5 | – | – | – | – |
| 1–2 | 49 | 516 | 418 | 246 | 744 |
| 3–4 | 35 | 834 | 730 | 465 | 1005 |
| >4 | 36 | 1548 | 1223 | 627 | 2344 |
| Presence of occluded lesion(s) | |||||
| Yes | 49 | 977 | 796 | 441 | 1265 |
| No | 76 | 877 | 636 | 350 | 1013 |
| Artery approach | |||||
| Radial | 89 | 845 | 642 | 380 | 1027 |
| Femoral | 32 | 1058 | 763 | 413 | 1120 |
| MD | 4 | – | – | – | – |
| Cine frames rate (frame s–1) | |||||
| Only 12.5 | 100 | 840 | 636 | 378 | 1049 |
| 12.5+25.0 | 14 | 913 | 788 | 526 | 1027 |
| Only 25.0 | 11 | 1613 | 1005 | 744 | 2402 |
| Collimation | |||||
| Never | 27 | 1032 | 939 | 630 | 1265 |
| At least once | 97 | 890 | 630 | 396 | 1005 |
| MD | 1 | – | – | – | – |
| Radiography mode | |||||
| Only “low” mode | 85 | 946 | 699 | 387 | 1119 |
| “Low” + “high” modes | 24 | 975 | 902 | 455 | 1049 |
| Only “high” mode | 16 | 671 | 550 | 403 | 946 |
| Use of the largest imaging intensifier (23 cm) | |||||
| Never | 103 | 893 | 698 | 396 | 1117 |
| At least once | 22 | 1027 | 718 | 387 | 1005 |
| Ventriculography | |||||
| Yes | 9 | – | – | – | – |
| No | 116 | 916 | 725 | 397 | 1118 |
MD, missing data; Q1, first quartile; Q3, third quartile.
aPrevious angioplasty and/or coronary artery bypass surgery. Mean values are presented only when the frequency exceeds 10. Maximum skin dose was missing for four percutaneous transluminal coronary angioplasties.